SAS(R) 9.1.3 Companion for z/OS

580 Parse Options Function Appendix 1
Figure A1.4 Initialization FRCB
R1
*
*
*
+0
+4
+8
+12
Parse Options Function
Initialization
function (INITFUNC):0
Pointer to User Exit
BAC Control Block
(INITEXIT)
Pointer to the amount of
storage below the 16M line
(INITBLN)
Pointer to the amount of
storage above the I16M line
(INITMALN)
The user exit can update this field.
UEBCB
Fullword
Fullword
In the Parse Options function, you validate both the name of the user exit and any
INFILE or FILE statement options that SAS does not recognize. SAS calls this function
once to process the user exit module name. SAS then calls the function for each
statement option that it does not recognize so that the function can process each option
and value string.
You can use two kinds of statement options in your user exit:
3 options that take a value, such as name=value. For example:
myopt=ABC
Note that quotation marks are considered part of the value; if you want them to
be stripped off, you must provide the code to do so.
3 options that do not take a value.
The first time the Parse Options function is invoked, it should do the following:
3 verify that the virtual storage that was requested during the Initialization
function has been allocated
3 initialize both the allocated virtual storage and the two data areas in the UEBCB
(User Word and Pointer to User Error Message).
The following figure illustrates the Parse Options FRCB structure and its
relationship to other control blocks: